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UI
Glyph
Blogger
Lock
DarkSlateGray
36x46
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Google Material Design icons
Wifi, Lock
Black
512x512
Very Basic. Android L (Lollipop)
private, Lock, protect
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Mixed
Simple Icons
Key, Lock
Unique-Round-Blue
Unlock, password, Safe
DeepSkyBlue
Icons Solid
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Network & communications
Material Device
screen, Lock, landscape
Orientation, portrait, Lock
325x512
Orientation, screen, rotation
Material Core
Lock, https, secure
356x512
Lock, open
Closed, secure, Lock
Closed, Lock
Mobile apps
app types in grey
Safe, security, secure
landscape, Lock, screen
Lock, screen, portrait
screen, Lock, rotation
shopping website
locked, Key, key lock
256x256
Geomicons
Octicons
384x512
Typicons
open, Lock